There were probably other slot racers who were paid to race and to represent the manufacturer they worked for, Team Russkit is one other who comes to mind.
But I'm betting no one has ever seen an actual contract of anyone paid to race slot cars.
Howie Ursaner was contracted to Cobra Slot Car Products starting in July 1967. You can read the details in the images below, but the annual income was $5,200 a year plus expenses. That sum would be over $40,000 a year in 2020.
Howie: "Here is my original contract to race slot cars for Cobra signed July 1967. My contract included an expense account that paid for all travel, parts, any expenses I had including gas for my '66 Corvette!"
Q: Did they renew?
"Yes, they did renew and I walked away during it to go be a free love hippie in San Francisco. They could not believe I was giving up all the money. I still remember sitting there telling them and they were astounded."
Those of us who know Howie probably aren't too surprised he bailed. After all, he was just going out while he was on top! LOL.
(Click on the images to enlarge them for much easier reading.)